EP0879698A1 - Un dispositif et un procédé pour imprimer une pièce d'oeuvre - Google Patents

Un dispositif et un procédé pour imprimer une pièce d'oeuvre Download PDF

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Publication number
EP0879698A1
EP0879698A1 EP98302411A EP98302411A EP0879698A1 EP 0879698 A1 EP0879698 A1 EP 0879698A1 EP 98302411 A EP98302411 A EP 98302411A EP 98302411 A EP98302411 A EP 98302411A EP 0879698 A1 EP0879698 A1 EP 0879698A1
Authority
EP
European Patent Office
Prior art keywords
printing
predetermined distance
speed
printing member
further characterized
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP98302411A
Other languages
German (de)
English (en)
Inventor
David Wang Man Ho
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Publication of EP0879698A1 publication Critical patent/EP0879698A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F17/00—Printing apparatus or machines of special types or for particular purposes, not otherwise provided for
    • B41F17/001—Pad printing apparatus or machines

Definitions

  • This invention relates to an apparatus and a method of printing a workpiece, and in particular a pad printing apparatus and a method of printing a workpiece with such a pad printing apparatus.
  • Conventional pad printing apparatus are set with a specific stroke depth (i.e. the distance travelled by the printing pad from its uppermost stationary position to the position when the printing action is complete) for each print task.
  • a specific stroke depth i.e. the distance travelled by the printing pad from its uppermost stationary position to the position when the printing action is complete
  • the print stroke may have to be adjusted in order to suit the size or shape of the workpiece to be printed. If the quantity of each print task is not large, such may require frequent adjustments of the stroke depth, thus reducing the efficiency, and increasing the cost, of the printing process.
  • the printing pad is engaged with a stationary part of the pad printing apparatus via a number of springs. Movement of the printing pad is sensed by a mechanical sensor. through a compressed spring. When the printing pad has moved through a predetermined distance, movement thereof is halted and reversed. Such an arrangement has to be manually adjusted every time there is a new print task. The performance of such a system also deteriorates rapidly by reason of mechanical failure of the springs through use.
  • a second arrangement is to arrange for an electronic pressure sensor to monitor the pressure within the pneumatic cylinder which drives the printing pad. Theoretically, the incoming and outgoing pressures of the pneumatic cylinder are the same such that there is no pressure difference. However, when the printing pad touches the workpiece to be printed, a back pressure is created which causes a difference in pressure, which is sensed by the pressure sensor. Corresponding signals are then transmitted to an integrated circuit which then causes the printing pad to reverse its direction of movement. Experience indicates that such an arrangement is not reliable and, in particular, the pressure sensor breaks down frequently.
  • a printing apparatus comprising at least one printing member movable in a first direction to print a workpiece, characterized in that said printing apparatus further comprises sensing means for measuring the speed of said printing member in said first direction, comparing means for comparing the average speed of said printing member in said first direction through an initial first predetermined distance with the speed of said printing member in said first direction beyond said first predetermined distance, wherein when the speed of said printing member in said first direction beyond said first predetermined distance falls below said average speed, said printing member is movable further in said first direction a second predetermined distance.
  • a method of printing a workpiece comprising the steps of (a) moving a printing member of a printing apparatus in a first direction towards said workpiece; characterized in that the method further comprises the steps of (b) measuring the speed of said printing member in said first direction; (c) calculating the average speed of said printing member in said first direction through an initial first predetermined distance; (d) comparing said average speed with the speed of said printing member in said first direction beyond said first predetermined distance; and (e) moving said printing member further in said first direction a second predetermined distance to print said workpiece when the speed of said printing member in said first direction beyond said first predetermined distance falls below said average speed.
  • a pertinent part of a pad printing apparatus is shown in Figs. 1 to 4. This pertinent part may be used in such pad printing apparatus as shown in GB 2305633 A1 to form a printing apparatus according to the present invention. In particular, this pertinent part may be used in pad printing apparatus which are pneumatically operated, hydraulically operated or motorized.
  • a pneumatic cylinder 2 is fixedly engaged with a stationary platform 4.
  • the pneumatic cylinder 2 is operable to move a printing pad 6 via a rod 8.
  • a target object 10 which may be a workpiece to be printed.
  • the printing pad 6 is fixedly engaged with an optical scale 12 the movement of which is sensed by an optical sensor 14 connected to a central processing unit (CPU) (not shown), such as an integrated circuit (IC), which acts as a controller.
  • CPU central processing unit
  • IC integrated circuit
  • a possible choice is Model No. 89C52 of Intel Corporation of the US.
  • a possible choice is Model No. EE-SX672 of Omron Industry of Japan.
  • the mode of operation of the pad printing apparatus is as follows.
  • the printing pad 6 descends from its uppermost position as shown in Fig. 1, it brings about a corresponding downward movement of the optical scale 12, which is sensed by the optical sensor 14.
  • the optical sensor 14 then monitors the movement of the optical scale 12 through a first predetermined distance, e.g. 20mm, which is set by the manufacturer of the printing apparatus.
  • the average velocity of the printing pad 6 through this initial 20mm will then be calculated by the CPU and stored as a reference speed.
  • the speed of the downward movement of the printing pad 6 will drop significantly to below the reference speed.
  • the controller will then send a signal which causes the printing pad 6 to move downward a second predetermined distance, which may be set by the user to suit the requirements of each print task. After travelling through the second predetermined distance, the printing pad 6 is retracted back to the position as shown in Fig. 1.
  • the printing pad 6 it is possible to arrange for the printing pad 6 to press against the target object 10 by a fixed distance, namely the second predetermined distance, irrespective of the actual distance of the target object 10 from the printing pad 6 when in its uppermost position. If the target object 10 is a workpiece to be printed, a consistent and uniform image may thereby be printed thereon irrespective of its distance from the printing pad 6.
  • an ink source e.g. an ink tray 16, which may be reciprocated in the directions of the arrows, between a first position in which it is below the printing pad 6 (as shown in dotted line), and a second position (as shown in solid line) in which the printing pad 6 may descend to print a workpiece 10.
  • the ink tray 16, when in its first position, is more than 20mm below the printing pad 6. In this arrangement, the ink tray 16 is first moved to the first position, the printing pad 6 then descends to pick up an inked image from the ink tray 16, and then ascends back to the uppermost position.
  • the ink tray 16 then moves to its second position, whereupon the printing pad 6 descends to print the workpiece 10 and then ascends back to its uppermost position, ready to start the cycle again. Due to the arrangement described in previous paragraphs, the image picked up from the ink tray 16 will be substantially identical to that printed on the workpiece 10, as the same pressure is applied when picking up the image and printing the workpiece 10.

Landscapes

  • Inking, Control Or Cleaning Of Printing Machines (AREA)
EP98302411A 1997-05-21 1998-04-01 Un dispositif et un procédé pour imprimer une pièce d'oeuvre Withdrawn EP0879698A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB9710450A GB2325434A (en) 1997-05-21 1997-05-21 An apparatus and a method of printing a workpiece
GB9710450 1997-05-21

Publications (1)

Publication Number Publication Date
EP0879698A1 true EP0879698A1 (fr) 1998-11-25

Family

ID=10812793

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98302411A Withdrawn EP0879698A1 (fr) 1997-05-21 1998-04-01 Un dispositif et un procédé pour imprimer une pièce d'oeuvre

Country Status (3)

Country Link
EP (1) EP0879698A1 (fr)
CN (1) CN1199670A (fr)
GB (1) GB2325434A (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005092617A1 (fr) * 2004-03-26 2005-10-06 Laurent De Volder Appareil d'impression au tampon sur produits presentant des variations notables, et procede correspondant
EP2746050A1 (fr) * 2012-12-20 2014-06-25 Teca-Print AG Machine d'impression par tampographie et procédé de fonctionnement d'une machine d'impression par tampographie
CN107264013A (zh) * 2017-07-20 2017-10-20 苏州市烨铭塑胶制品厂 一种自动适应智能移印机系统

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2154671A1 (de) * 1970-11-03 1972-05-25 Ridgway Potteries Ltd., Stoke-on-Trent, Staffordshire (Großbritannien) Vorrichtung zum Verzieren von Werkstücken
EP0472021A1 (fr) * 1990-08-21 1992-02-26 Porzellanfabrik Schirnding AG Machine à timbrer pour application d'une image sous une glaçure
EP0581096A2 (fr) * 1992-07-30 1994-02-02 Markem Corporation Machine d'impression au tampon et système de commande
EP0677385A1 (fr) * 1994-04-13 1995-10-18 Alexander Mühlhäusser Machine à imprimer, en particulier machine d'impression au tampon
DE19510677A1 (de) * 1995-03-27 1996-10-02 Alexander Dipl In Muehlhaeuser Rotationsdruckmaschine, insbesondere Tampondruckmaschine
GB2305633A (en) * 1995-09-29 1997-04-16 Ho Wang Man David A printing apparatus

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4407193A (en) * 1980-06-16 1983-10-04 International Business Machines Corporation Solenoid impact print hammer with uniform free flight time
DE4025359A1 (de) * 1990-08-10 1992-02-13 Triumph Adler Ag Verfahren zur einstellung der abdruckenergie einer type und schreibmaschine, drucker o. dgl. zur durchfuehrung des verfahrens
US5383399A (en) * 1993-09-27 1995-01-24 Ncr Corporation Zero hammer adjustment drum printer control technique

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2154671A1 (de) * 1970-11-03 1972-05-25 Ridgway Potteries Ltd., Stoke-on-Trent, Staffordshire (Großbritannien) Vorrichtung zum Verzieren von Werkstücken
EP0472021A1 (fr) * 1990-08-21 1992-02-26 Porzellanfabrik Schirnding AG Machine à timbrer pour application d'une image sous une glaçure
EP0581096A2 (fr) * 1992-07-30 1994-02-02 Markem Corporation Machine d'impression au tampon et système de commande
EP0677385A1 (fr) * 1994-04-13 1995-10-18 Alexander Mühlhäusser Machine à imprimer, en particulier machine d'impression au tampon
DE19510677A1 (de) * 1995-03-27 1996-10-02 Alexander Dipl In Muehlhaeuser Rotationsdruckmaschine, insbesondere Tampondruckmaschine
GB2305633A (en) * 1995-09-29 1997-04-16 Ho Wang Man David A printing apparatus

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005092617A1 (fr) * 2004-03-26 2005-10-06 Laurent De Volder Appareil d'impression au tampon sur produits presentant des variations notables, et procede correspondant
EP2746050A1 (fr) * 2012-12-20 2014-06-25 Teca-Print AG Machine d'impression par tampographie et procédé de fonctionnement d'une machine d'impression par tampographie
CN107264013A (zh) * 2017-07-20 2017-10-20 苏州市烨铭塑胶制品厂 一种自动适应智能移印机系统

Also Published As

Publication number Publication date
CN1199670A (zh) 1998-11-25
GB2325434A (en) 1998-11-25
GB9710450D0 (en) 1997-07-16

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